If 2048 is the broken rip-off, what does that make 16384 [http://annimon.github.io/16384/]?
Honestly, 99% of the time I am all for sticking up for originality and the creators who were copied. But from what they described, Threes sounds like frustrating, mind-flaying tedium. 2048 though? That was tricky, but I had fun with it. It takes maybe 30 minutes to an hour to beat, if you're smart, but it's still a challenge in its own right.
Now that 16384 thing I linked, that is a worthless, broken rip-off. Due to the size of the board they give you, it can be 'won' by simply cycling up-left-down-right (or in reverse order if you prefer a clockwise spin). The tiles will eventually merge high enough to reach the given number.